Lead Placement for 12 Lead

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I am looking at a picture in my book for the placement of electrodes for a 12 lead ekg and it only shows 10 leads! But it specifically says 12 lead ecg, which I always assumed meant 12 electrodes. There is 1 on each wrist, 1 on each ankle, 5 on the left side of the chest, and 1 on the right side of the chest. It only adds up to 10, where do the other 2 leads go? Thank you

The three "augmented" leads are "generated" by using the existing leads. There are additional electrodes that go on the body for those leads. Using a standard 3 lead monitor, I can approximate 9 of the 12 leads. As long as you put the electrodes and leads (wires) in the right places, the machine can electrically "create" those three other leads. I've heard of EKG technology that can generate multiple leads from 5 precisely placed electrodes... Such technology is likely expensive and may not yet be on the market in any large numbers. but it's very cool stuff because you can "see" any lead you desire.

It's OK to wonder about such things. I did at first until it was explained to me about how the machine works to create the augmented leads.